Grinding machine



Dec. 11, 1923. 1,477,158 A. E. WESTMAN GRINDING MACHINE Filed April 2, 1921 3 Sheets-Sheet 1 Dec; '11, 1923.

A. E. WESTMAN GRINDING MACHINE 3 Sheets-Sheet 2 Filed April 2, 1921 Dec. 11 1923. 1,477,158

A. E. WESTMAN GRINDING MACHINE Filed April 2, 1921 3 Sheets-Sheet 3 l l l swam H01 Patented Dec. 11, 1923.

ALMAR E. wns'rrmn, or FENTON, irrcnreemnssrenoa or onn-rouarn ro' CHARLES H. LEA, one-room TO eusrar ALEXANDER OLO'ESON, AND oNE-rouarrr 'IO CHARLES onorson, ALL or rmrron, mrcnrenn. I I

GRINDING MAGHINE.

Application filed April 2, 1921. Serial No. 458,167.

To aZZwhom it may concern Be it known that I, ALMAR E. WESTMAN, citizen of the United States, resid'n at Fenton, county of Genesee, State of M ichigan, have invented a certain new and useful Improvement in Grinding Machines, and

declare the following to be a full, clear, and

exact description of the same, such as will enable others skilled in'the art to which it w pertains to make and use the same, reference being had to the accompanying drawings, which form a part of thisspecification.

The object of my invention is to provide a grinding machine of simple, durable and inexpensive construction.

A further object of myinvention is to provide such a machine in which the grinding member or wheel is reciprocated as well as rotated so that the work may be more uniformly operated upon and so that the grinding wheel itself may last longer.

A further object of my invention is to provide an improved drive whereby the grinding wheel may be rotated andreciprocated at the same time from the same drive shaft whilethe rigidity of the'machine is retained.

A further object of my invention is to provide a machine having a reciprocating head in which is mounted a non-slidable spindle so that great rigidity may be secured thereby andto provide in connection with this driving head means for removing the dust and for protecting the moving parts from the dust where necessary. 7

A further object of my invention is to provide an improved driving means forreciprocating the grinding head and means for varying the speed of the grinding spindle relative to that of both the drive shaft and the shaft whichcauses reciprocation of the grinding head. I

With these and other objects in view, my invention consists in the arrangement, construction and combination of the various parts of my improved machine as stated in the objects, described in the specification, and shown in the drawings, in which Figure 1 shows a side elevation of my improved machine, parts being shown in section to better illustrate the construction.

Fig. 2shows a front elevation thereof:

Fig. 3 shows a topor plan view thereof,

the work supporting table being partly remoged to better illustrate the construction, an

Fig. a shows an enlarged detail sectional view illustrating a portion of the mechanism for reciprocating the grinding head.

Referring to the accompanying drawings, I have used the reference numeral to indicate generally a substantially square base member having an extension 11 at the rear thereofv which supports spaced bearings 12 and 13. Journaled in the bearings 12 and 13 is the main drive shaft 14: which carries spaced sets of pulleys 15 and 16. The sets of pulleys each include two pulleys of different diameters in the drawings, but more may be used if desired.

At the top of the stand 10, a pair of shelves 17 project laterally and form a support to which a casting- 18 is secured. The casting 18 is designed to form'the support for the work-supporting platform or table 19 and guides are'also formed therein to carry the reciprocating grinding head. The guides shown in the drawings consist of what may be termed a keyway illustrated at 20 and which may, if desired, be so arranged that one side is detachable to permit ready removal of the grinding head therefrom. I Such an arrangement is illustrated by the use of the strip 21 which is secured by the screws'22 to the casting 18 and provided with inclined faces to conform to the shape of the co-acting portion of the grindinghead and to permit taking up any wear by tightening the screws 22.

The grinding head itself comprises a-body member 23 having inclined edges designed to co-act' with the guiding portions 20 of the casting 18 to' permit vertical, reciprocation of the'grinding head and it also haslugs 24 and 25 extending forwardly therefrom to form supports for the grinding "spindle. Ball bearings 26 or other suitable bearing members may be inserted in thelugs 24 and f 25 to support the grinding-spindle 27; Between the bearings 26 and between the lu s 24: and 25 a pulley 28'is secured to the grin ing spindle and a grinding wheel 29. is secured to the spindle above the upper bear- 1 ing 26. Between the grinding wheel 29 and the bearing 26 a shoulder is formed in the spindle and a dust etticoat 30 is forced onto the spindle so that the top of the petticoat is contiguous with the lower surface of the shoulder mentioned. The upper lug is preferably provided with an upwardly extending annular flange on its upper surface andaroundthe upper bearing 26. The dust petticoat is preferably provided with a downwardly extending flange at its outer edge which is disposed just outside of the flange on the lug so that when the, inding spindle is rotated, then the dust from the grinding will be caught by the petticoat or thrown clear by it so that such dust will not get into the bearing 26. As the lower bearing 26 is below both the pulley 28 and the lug 25, it will be seen that practically none of the grinding dust can get into either of these hearings to thereby injure the bearings. A dust cover 30 is shown as being secured to the lugs 24 and 25 to protect the inner bearings from the dust produced by the grinding member.

Extending rearwardly from the stand 10 near the top thereof is a shelf 31 which supports at its rear end a bearing-32 A bracket 33 has'a forwardly extending stub 34 formed thereon which enters the bearing 32 and is held from movement therein when desired by a set screw 35. The bracket 33 has idler pulleys 36 at either end thereof and a" belt 37 is extended around one of the pulleys 16 over the idler pulleys 36 and around the spindle pulley 28. In this connection it may be mentioned that the bodyportion of the then the set screw 35 may be tightened to prevent the parts from slipping out of adjustment.

Extending from one side of the stand 10 in position belowtheshelves 17 are a pair of ears 38 which fonnbearings for a shaft 39.. The shaft 39 carries a pair of contiguous pulleys40 of different diameters inposition where a belt 41 may be placed over the'pullevs 15 and40 to drive-the shaft 39 from the drive shaft 14 at the desired speed.

The shaft 39 carries a relatively small gear '42 which in turncco -acts with. a relatively large gear 43; mounted: on. a shaft44 which isparallelwith. the shaft 39. and journaled atsubstantially thecenter of the stand 10.

Fixedto the shaft 44 is, aneccentric 45.' A

pair of spaced ears 46 are extended downwardly from the bottom of the body 23 of the grinding head and carry-var wrist pin 47 desired, be provided with outwardly extending annular'flanges at its edgesso that-the eccentric is received within a channel. Shims 53. may be placed between. the portions. of the eccentric strap for the purpose of ad.- justing it to take careof any Wear so that the operation of the eccentric may beas. free from vibration as ispossible. Supportedby the casting 18 is the work: table. 19 and the latter carries a dust. hood 54 which. covers .1

the rear half of the grinding. wheel 29. EX- tending rearwardly from the dust..hood.54 is a tube 55 through. which air may. be drawn so that: the major portionof the dust, formed by the grinding operation. maybe. drawn:

away from the-machine through this tube 55. In this connectionit will be noted that the work supporting. table 19 may, if desired, he pivotally mounted. Onrstuds 56, carried by the casting 18,. so that the work tableimay 1 be inclined. at anv angle.' Such a structure would, of course, include means for locking the table in anydesired position. n Among the many advantages of my proved. device it is especially pointed. out.)

that it is so constructed that the-parts are very rigid and vibration is reduced to a-minimum.. This is very important in a grinding machine of this type as vibration ofthe machine will tend to make thework; of'the i grinding wheel irregular, besides causing undue wear on the parts. It may also be mentioned. that the speed of'rotation may be varied. to the speed of reciprocation and that means are providedfor protectinghthemoving parts where necessary against-injurious dust. p

Some changes may be made in the constructionand arrangement of the various parts of my device without. departing from the spirit of my invention. and it is my intention to cover such changes in the following claim..

What I claim 1s:

In a grinding machinaan uprightfi'ame, I: abearing block rigid with the frame having a vertical guide-way for-a grinding1head, a

'grindingheadl having a body. portion mounted in said guide-way for vertical movement and offset spacedrapant armportions-having E bearingsfor a spindle,;the;uppermost arm portion, provided with. an upwardly-extending annular flange concentric said spindle having a downwardly-extending flange bearing a spindle journaled vertically in freely encircling the upwardly-extending said arm portions for rotation extending up flange of the upper arm.

Wardly above the upper arm, said spindle In testimony whereof, I sign thisspecifi- 5 provided with a shoulder above she upper cation.

arm, a dust cap carried by said spindle encircling the same below said shoulder and ALMAR E. WESTMAN. 

